Drive-wheel for elevators



(No'ModeL) 2 sheets-sum 1.

G.,S.PO UTS. DRIVE WHEEL FOR ELEVATORS, CARRIERS, OR. THE LIKE.

Patented'May 28,.1895.

/Iill WITNESSES:

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(No Model.) 2 Sheets-Sheet 2.

, G. s. POUTS. DRIVE WHEEL FOR ELEVATORS, GAERIERS, OR THE LIKE. No.540,158. Patented May 28, 1895.

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ilm'rno STATES PATENT Urrrcn.

GEORGE S. FOUTS, OF SAN JOSE, CALIFORNIA.

DRIVE-WHEEL FOR ELEVATORS, CARRIERS, OR THE LIKE.

SPECIFICATION forming part of Letters Patent No. 540,158, dated May 28,1895.

Application filed February 13 1895, Serial No. 538,217. (No model.)

- of which the following is a specification.

This invention is an improvement in driving wheels for elevators andother carriers, and for other uses where it is desired to drive a rope,cable or other band for any desired purpose.

The invention is especially designed to provide means whereby the cablemay be strongly gripped when desired and may adjust itself to carrierflights or other projecting portions on the cable or to sticks or otherobstructions that may occur upon the cable and between the same and theband clamping sections.

The invention has for further objects to provide means whereby theclamping sections may be moved positively in one direction.

' The invention has for further objects other improvements and consistsin certain novel constructions, combinations and arrangeinents of partsas will be hereinafter described and pointed out in the claims.

In the drawings, Figure 1 is a top plan view of my improved wheel,portions of the framing being shown. Fig. 2 is a side view of the wheel,two of the side bearing-plates being removed. Fig. 3 is a transversesection on about line 3 3, Fig. 2. Fig. 4 is a section on about line 4 4of Fig. 3. Figs. 5, 6, and 7 are detail views of the cam-block. Fig. 8is a detail view of one of the clamping-sections. Fig. 9 is a detailview representinga construction of clamping-sections designed fordrivingtwo bands side by side, and Figs. 10, 11, and 12 showconstructions differing in some respects from each other and from theconstruction shown in Figs. 2 and 3.

My driving wheel as shown comprises a pulley A which has a rim B and aweb 0, the web 0 being keyed or otherwise secured to the shaft D, andsuch shaft being journaled in the frame E which manifestly may be of anysuitable construction. This pulley A carries the clamping sections,which are movably connected or supported by said pulley so they may moveinto and out of binding contact with the cable G, the purpose being topermit said cable to move freely between such sections as it moves intocontact with the wheel and then to cause such sections to be pressedtogether or upon such cable during a portion of the revolution of thewheel to transmit positively to such cable the motion of the-wheel andto drive the cable without any slipping of same upon its drive wheel. iIn doing this, Iprovide cam devices by which to actuate the clampingdevices in one direction.

In the construction shown in Fig. 12 I provide cam devices in thenatureof stationary cam grooves H, which tend to actuate the clampingdevices in both directions, and in Fig. 11, the cam devices are providedupon the circumference of a fixed block I, such cams v. engaging withrolling bearings 'i on pivoted clamping devices J, Whose clampingsurfaces operate with a shearing action, as will be understood from saidfigure. In this construction shown in Fig. 11, a spring J tends to drawthe clamping devices J into contact with the cable, the cams operatingto release the clamping devices from the cable and to maintain themspread in position to free the upper run of the cable and tosubsequently receive between them the lower run of the cable.

In the construction shown in Figs. 2 and 3, the clamping devices arecomposed of pairs of sliding pieces K having clamping surfaces K,provided in advance of said clamping surfaces withoverlapping extensionsor portions K which are provided with spring recesses and have inwardlyprojecting portions K for engagement by the cam surfaces by whichthesliding pieces K are positively operated. inone direction. Theseclamping pieces K operate in suitable guideways in the pulley rim B andthe sections of each pair are so arranged that their clamping surfaces Kare caused to bind upon opposite sides of the cable during certainportions of the travelof the pulley, this being preferably effected bymeans of springs L seated in the recesses K bearing between the innerwall of such recess and a suitable stop and compressed so they will tendto force the spring sections inward. The stop for the outer ends ofspring L comprise followers M supported on screws M turning throughremovable face plate sections M By this construction the tension of thesprings may be vide cam devices so related that in the arrangement shownin Fig. 2 the cam sections when they reach a point about Z, will bespread apart to receive the cable, will then be freed so the springs maypress them into binding contact with the cable and will be maintained insuch binding contact until they reach the point about Z when they willagain be forced apart to release the cable.

It should be understood that the arrangement of the cam devices to bindand release the clamping sections, may be varied in any case to suit thedirection in which the cable is lead into and passes out of engagementwith the driving wheel.

In the construction shown in Figs. 2, 3, 6 and 7 the cam devices areprovided upon or form parts of cam blocks N which are fixed to thesupporting frame or otherwise held from turning with the pulley. Aspreferred this is effected by means of projecting bars or arms N on thecam blocks, entering openings E in the frame, the arms N beingpreferably secured adjustably in said openings by means of screws E sothe cams may be adjusted to spread the clamping sections apart todifferent degrees as may be desired to ad apt the driving Wheels tocables of different sizes as will be readily understood.

The cams proper are in the construction shown in Figs. 3, 5, 6 and 7composed of radial ribs N on the inner ends of the cam blocks N, suchribs having their outer sides provided with the portions N and Nconnected by the abrupt inclined shoulders N whereby the clampingsections are directed from the portion N out on to the portions N andthen back onto the portion N It will be seen that when the projections Kof the clamping sections are riding upon the portions N of the camdevices, the springs will be permitted to press such clamp devices intobinding contact with the cable and that such binding contact willcontinue until the portion K rides up the shoulders N onto the portion Nthus spreading the clamping sections apart in which position they willbe held until the next shoulder N is reached when they will again bepermitted to move inward onto the cam portion N The inwardly projectingportion K of the clamping sections may preferably be provided with ananti-friction roller is to press against the cam surface of the camblock. As will be understood from Figs. 3 and 4, the inwardly projectingportions K project below the path of the cable in all positions of thesaid sections and thus operate power is desired to be exerted upon acable free of carrier portions or projections, the construction shown inFig. 10 may be preferred. In this construction, the cams are reversedand arranged to bear upon the outer instead of the inner sides of theprojections K and the springs L are connected in such manner as to exertan outwardly drawing tension upon the clamping sections, the operationbeing as follows: The cams tend to force the clamping sections intopositive binding contact with the cable, while the springs draw them outof such contact, such operation being practically a reversal of thateffected by the construction shown in Fig. 3, as will be understood froma comparison of Figs. 3 and 10.

In the construction shown in Fig. 10 itis sometimes desired to vary thedegree of pressure exerted by the clamping sections upon the cable, andthis may be effected by supporting the cam blocks therein shown to movein or out, providing at the outer side of such cam blocks, cams orinclines O, engaged by cams P on a bail P journaled 0r pivoted upon theshaft D extending over the cable and having a pulley P bearing above thecable as shown. The cams O and P are so related to each other and to thebail P, which is pressed downwardly by springs Q, that as the bail isdrawn upward against the tension of springs Q, the cam blocks will beforced inward, such inward pressure of the cam blocks increasing withthe upward movement of the bail P. Thus in operation the tension ofsprings Q upon bail P will cause such bail to press the upper run of thecable down out of its taut alignment. Then as strain is exerted on saidcable it will tend to straighten, and thus exert a lifting tendency onthe bail P so that the greater the strain on the cable, the morestrongly will the cam blocks operate to press the clamping sections intocontact with the cable.

In the construction shown in Fig. 9, the two clamping sections of thepair are shown asprovided each with two clamping surfaces, the purposebeing to adapt such clamping sections to secure two cables where it isdesired to drive two cables with the same wheel. It is manifest that theclamping surfaces of the pairs may be increased as may be desired.

In dotted lines Fig. 8, and in the detail view immediately below Fig. 8I show a removable surface for the rope clamping sections which can bereplaced in case of wear or injury without necessitating the replacingof the entire section. Manifestly this removable wear surface may bemade in dilferent forms and secured in various ways as may be desired.

Having thus described my invention, what I claim 'is- 1. A drive wheel,comprising a revolving pulley having a support, and clamping sectionsmovable in said support toward and from each other, combined withopposite cam surfaces held from turning and arranged to operate theclamping sections, substantially as set forth. p

2. A drive wheel, composed of a revolving pulley, clamping sections bothmovable in said pulley toward and from each other, and fixed camsurfaces one for each clamping section andarranged to operate the same,substantially as set forth.

3. A drive Wheel, composed of the framing, the shaft, the pulley fixedto the shaft and provided with the clamping sections both movable towardand from each other and opposite stationary cam surfaces one for eachclamping section such surfaces extending around the shaft, allsubstantially as and for the purpose set forth.

4:. The combination of the frame, the pulley revolving therein, theclamping sections movably supported by said pulley and the cam likeabutments fixed with respect to the frame and arranged to operate theclamping sections, substantially as and for the purposes set forth.

5. A drive wheel comprising a revolving pulley having rope or bandclamping sections, springs operating said sections in one direction andcam like abutments operating said sections in the opposite directions,the said cam like abutment being held from turning with the pulley,substantially as and for the purposes set forth.

6. A driving wheel comprising the revolving pulley, the rope or bandclamping sections movable transversely in a direction parallel to theaxis of said pulley into and out of clamping position and means foroperating said clamping sections, substantially as and for the purposesset forth.

7. A driving wheel comprising a pulley, the clamping sections movabletransversely into and out of clamping position and provided withmortises or recesses leading from their ends and actuating springsoperatingiu said mortises or recesses, substantially as set forth.

8. A driving wheel comprising a revolving pulley, the removable clampingsections supported by said pulley, the cam blocks held from turning withthe pulley and having the cam portions or abutments, the projections orportions on the inner sides of the clamping sections bearing outside thecam portions and springs actuating said clamping sections in oppositionto the cams, substantially as and for the purposes set forth.

9. In a driving wheel, the transversely mov able clamping sectionsarranged in pairs, the sections of each pair being formed at their inneradjacent ends with clamping surfaces and with overlapping guide portionsand means whereby to operate said clamping sections, substantially asset forth.

. 10. The combination of the rope or band clamping sections, the camblocks, the frame having openings, the arms or bars projecting from thecam blocks into the openings in the frame and clamps securing the saidarms or bars in the frame openings whereby to secure the clamp blocksadjustably, substantially as set forth.

11. The combination of the shaft, the web portion keyed to such shaftand a rim portion, the rope or band clamping sections supported by saidrim and movable into and out of clamping position and the cam portionsor abutments arranged on opposite sides of the pulley web and engagingand operating the clamp sections, substantially as and for the purposesset forth.

12. A driving wheel comprising the pulley the clamping sections havingclamping surfaces and provided in their outer ends with recesses, thesprings bearing in such recesses, the follower for the outer ends ofsuch springs and adjusting devices for said followers, all substantiallyas and for the purposes set forth.

13. In a driving wheel, the transversely movable clamping sectionsarranged in pairs, the sections of each pair being provided at theirinner ends with clutching surfaces and also with overlapping guidesurfaces and provided in their outer ends with sockets, the springsfitting in said sockets, means for adjusting the tension of such springsand the cam surfaces or abutments operating said sections in oppositionto the springs, all substantially as and for the purposes set forth.

14. The improvementin drive wheels herein described consisting of theshaft, the framing, the shaft journaled therein, the pulley having webportions keyed on the shaft and a rim portion provided with ways, theclamping sections movable in said ways having interlapping guideportions'at their inner meeting ends, springs by which said sections maybe pressed inward, the cam blocks on opposite sides of the pulley Weband connections between said cam blocks and the frame, whereby saidblocks are held from turning with the pulley, all substantially as andfor the pur- Witnesses:

P. B. TURPIN, SoLoN G. KEMON.

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